This research is to explore the metric information asymmetric problems between of banks and borrowers by jointly analyzing the younger and older group mortgagers separately. The sample period ranges from January 2003 to December 2004, in terms of loan approval date. The main results show that default amount increase, young group are positive correlation significantly, then it exist asymmetric information problems; and that the younger group are more information asymmetric magnitude than thone of the order group.